Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 2 - Test - Page 433: 3

Answer

The value of the operation for the expression $2\sqrt{-49}+3\sqrt{-64}$ in the standard form is $38i$.

Work Step by Step

Consider the expression: $2\sqrt{-49}+3\sqrt{-64}$ Rewrite the expression $2\sqrt{-49}+3\sqrt{-64}$ as $2\sqrt{49}\sqrt{-1}+3\sqrt{64}\sqrt{-1}$ As $i=\sqrt{-1}$ Therefore, $\begin{align} & 2\sqrt{49}\sqrt{-1}+3\sqrt{64}\sqrt{-1}=2\left( 7 \right)i+3\left( 8 \right)i \\ & =14i+24i \end{align}$ Combine the real part and imaginary part separately and either add or subtract as required. $14i+24i=38i$ So, $2\sqrt{-49}+3\sqrt{-64}=38i$ Hence, the value of the operation for the expression $2\sqrt{-49}+3\sqrt{-64}$ in the standard form is $38i$.
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